chessprogramming - Blockage Detection - Edited Oct 19, 2017 by <a class="userLink" href="https://www.wikispaces.com/user/view/GerdIsenberg" style="outline: none;"><img src="https://www.wikispaces.com/user/pic/1202793136/GerdIsenberg-lg.jpg" width="16" height="16" alt="GerdIsenberg" class="userPicture" /></a> <a class="userLink" href="https://www.wikispaces.com/user/view/GerdIsenberg" style="outline: none;">GerdIsenberg</a>